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http://dx.doi.org/10.12925/jkocs.2002.19.4.13

Self-Diffusion Coefficients of Colloidal Association Structures in ADS/OTAC Mixed Aqueous Solutions by Pulsed (Field) Gradient Spin Echo-NMR  

Kim, Hong-Un (Department of Chemical Engineering, Chung-Ang University)
Lim, Kyung-Hee (Department of Chemical Engineering, Chung-Ang University)
Kim, Eun-Hee (Magnetic Resonance Team, Korea Basic Science Institute)
Cheong, Chae-Joon (Magnetic Resonance Team, Korea Basic Science Institute)
Publication Information
Journal of the Korean Applied Science and Technology / v.19, no.4, 2002 , pp. 339-348 More about this Journal
Abstract
Self-diffusion coefficients of colloidal ass9Ciation structures in the aqueous solutions of anionic ammonium dodecyl sulfate (ADS) and cationic octadecyltrimethylammonium chloride (OTAC) surfactants were measured by pulsed-gradient spin echo NMR. The results were interpreted on the basis of the ADS/OTAC/water phase diagram. Crossing the phase boundaries, significant changes in self diffusion coefficients were observed and well correlated to the phase diagram. For the micelles their apparent radii were obtained from Stokes-Einstein equation. Their values were 15 for the ADS micelles and 54 ${{\AA}}$ for the OTAC micelles, respectively. For vesicles which were formed spontaneously at different relative amounts of the surfactants and total surfactant concentrations, the radius was measured as 50 to 200 nm. This result is in fair agreement with those by TEM and light scattering.
Keywords
Pulsed gradient spin echo (PGSE) NMR; self-diffusion coefficient; mixed micelle; ammonium dodecyl sulfate; octadecyltrimethylammonium chloride;
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